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NXP Semiconductors
PCA85132
LCD driver for low multiplex rates
7.1.4 Command: bank-select
The bank-select command controls where data is written to RAM and where it is displayed
from.
Table 10. Bank-select - command bit description
Bit
7 to 2
Symbol
-
Value
111110
Description
Static
fixed value
1:2 multiplex [1]
1
I
input bank selection ; storage of arriving display data
0 [2]
1
RAM row 0
RAM row 2
RAM rows 0 and 1
RAM rows 2 and 3
0
O
output bank selection ; retrieval of LCD display data
0 [2]
1
RAM row 0
RAM row 2
RAM rows 0 and 1
RAM rows 2 and 3
[1]
[2]
The bank-select command has no effect in 1:3 and 1:4 multiplex drive modes.
Default value.
7.1.5 Command: blink-select
The blink-select command allows configuring the blink mode and the blink frequency.
Table 11. Blink-select - command bit description
Bit
7 to 3
2
1 to 0
Symbol
-
AB
BF[1:0]
Value
11110
0 [1]
1
00 [1]
01
10
11
Description
fixed value
blink mode selection
normal blinking [2]
alternate RAM bank blinking [3]
blink frequency selection
off
1
2
3
[1]
[2]
[3]
Default value.
Normal blinking is assumed when the LCD multiplex drive modes 1:3 or 1:4 are selected.
Alternate RAM bank blinking does not apply in 1:3 and 1:4 multiplex drive modes.
7.1.6 Clock frequency and timing
The timing of the PCA85132 organizes the internal data flow of the device. The timing
includes the transfer of display data from the display RAM to the display segment outputs
and therefore the frame frequency.
7.1.6.1
Clock source selection
The PCA85132 can be configured to use either the built-in oscillator or an external clock
as clock source:
PCA85132
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 3 — 11 July 2013
? NXP B.V. 2013. All rights reserved.
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